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Finding the Fourth Proportional to 917.40, 1,375.61 and 455.03

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Solution

The fourth proportional to 917.40, 1,375.61 and 455.03 is: 682.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.40 : 1,375.61 = 455.03 : x
  2. Step 2: Convert to fraction form
    917.40/1,375.61 = 455.03/x
  3. Step 3: Cross multiply
    917.40x = 1,375.61 × 455.03
  4. Step 4: Simplify right side
    917.40x = 625,934.67
  5. Step 5: Solve for x
    x = 625,934.67/917.40
  6. Step 6: Final answer
    x = 682.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.